[Freeswitch-users] RTP Timing
David Ponzone
david.ponzone at gmail.com
Wed Jul 21 08:54:03 PDT 2010
Steven,
sure, and in the default config, rtp-rewrite-timestamps is commented
out and false by default.
David Ponzone Direction Technique
email: david.ponzone at ipeva.fr
tel: 01 74 03 18 97
gsm: 06 66 98 76 34
Service Client IPeva
tel: 0811 46 26 26
www.ipeva.fr - www.ipeva-studio.com
Ce message et toutes les pièces jointes sont confidentiels et établis
à l'intention exclusive de ses destinataires. Toute utilisation ou
diffusion non autorisée est interdite. Tout message électronique est
susceptible d'altération. IPeva décline toute responsabilité au titre
de ce message s'il a été altéré, déformé ou falsifié. Si vous n'êtes
pas destinataire de ce message, merci de le détruire immédiatement et
d'avertir l'expéditeur.
Le 21/07/2010 à 17:44, Steven Ayre a écrit :
> That's not quite true - if it depends on the value in the sip
> profile of:
> <param name="rtp-rewrite-timestamps" value="true"/>
>
> Sonus is known to have timestamp problems. Is there a Sonus gateway
> anywhere in the media path?
>
> -Steve
>
>
> On 21 July 2010 15:51, David Ponzone <david.ponzone at gmail.com> wrote:
> Neil,
>
> as far as I know, by default, FS is transparent for timestamps.
> It writes in outbound RTP the exact timestamp that it received in
> inbound RTP.
> So you should perhaps have a look at the sending endpoint ?
>
> David Ponzone Direction Technique
> email: david.ponzone at ipeva.fr
> tel: 01 74 03 18 97
> gsm: 06 66 98 76 34
>
> Service Client IPeva
> tel: 0811 46 26 26
> www.ipeva.fr - www.ipeva-studio.com
>
> Ce message et toutes les pièces jointes sont confidentiels et
> établis à l'intention exclusive de ses destinataires. Toute
> utilisation ou diffusion non autorisée est interdite. Tout message
> électronique est susceptible d'altération. IPeva décline toute
> responsabilité au titre de ce message s'il a été altéré, déformé ou
> falsifié. Si vous n'êtes pas destinataire de ce message, merci de le
> détruire immédiatement et d'avertir l'expéditeur.
>
>
>
>
> Le 21/07/2010 à 16:36, Neil Burgess a écrit :
>
>> Hi,
>>
>> We are capturing packets for call quality monitoring purposes, and
>> as part of the capture, we are grabbing the outbound packets from
>> FreeSwitch. We are noticing what appears to be an odd behaviour in
>> the RTP sequence timing where suddenly the timing will jump from
>> the regular 160 increments to a number in the 10’s of millions! See
>> packet 38 below. Now I have no idea as to whether such a timing
>> change is OK in RTP, and although the actual RTP stream does not
>> appear to be affected, I do see that Wireshark believes there is a
>> massive amount of jitter on the line when it analyses the packets,
>> and any RTCP Sender Reports from the target device (and indeed
>> several different target types have been tried) also report very
>> large inter arrival jitter numbers at this point! It’s the RTCP
>> side of things that are more of interest here, as trying to get
>> accurate results of our downstream jitter by capturing the returned
>> RTCP packets. I believe that all the times we see this, there is
>> however a Marker bit present!
>>
>> So I guess the question is whether this is expected behaviour, and
>> if not any ideas?
>>
>> No. Time Source Destination
>> Protocol Info
>> 1 0.000000 gmtpbx02.redmatter.com sil1.magrathea.net
>> SIP/SDP Request: INVITEsip:441277849884 at sipipgw.magrathea.net,
>> with session description
>> 2 0.001595 sil1.magrathea.net gmtpbx02.redmatter.com
>> SIP Status: 100 Giving a try
>> 3 1.103160 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=0, Time=0
>> 4 1.124816 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=1, Time=160
>> 5 1.142758 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=2, Time=320
>> 6 1.163702 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=3, Time=480
>> 7 1.184239 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=4, Time=640
>> 8 1.203259 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=5, Time=800
>> 9 1.223456 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=6, Time=960
>> 10 1.243953 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=7, Time=1120
>> 11 1.264504 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=8, Time=1280
>> 12 1.284839 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=9, Time=1440
>> 13 1.304590 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=10, Time=1600
>> 14 1.323589 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=11, Time=1760
>> 15 1.344672 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=12, Time=1920
>> 16 1.359227 sil1.magrathea.net gmtpbx02.redmatter.com
>> SIP/SDP Status: 183 Session Progress, with session description
>> 17 1.364522 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=13, Time=2080
>> 18 1.377484 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53974, Time=160, Mark
>> 19 1.383466 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=14, Time=2240
>> 20 1.397476 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53975, Time=320
>> 21 1.403953 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=15, Time=2400
>> 22 1.417484 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53976, Time=480
>> 23 1.423616 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=16, Time=2560
>> 24 1.437474 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53977, Time=640
>> 25 1.444930 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=17, Time=2720
>> 26 1.457475 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53978, Time=800
>> 27 1.463341 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=18, Time=2880
>> 28 1.477473 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53979, Time=960
>> 29 1.484235 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=19, Time=3040
>> 30 1.497483 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53980, Time=1120
>> 31 1.503415 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=20, Time=3200
>> 32 1.517474 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53981, Time=1280
>> 33 1.523541 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=21, Time=3360
>> 34 1.537472 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53982, Time=1440
>> 35 1.543428 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=22, Time=3520
>> 36 1.557567 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53983, Time=1600
>> 37 1.563656 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=23, Time=3680
>> 38 1.577496 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53984, Time=130238272, Mark
>> 39 1.584747 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=24, Time=3840
>> 40 1.597474 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53985, Time=130238432
>> 41 1.603871 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=25, Time=4000
>> 42 1.617465 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53986, Time=130238432
>> 43 1.624224 lon-avon-four.magrathea.net
>> gmtpbx02.redmatter.com RTP PT=ITU-T G.711 PCMU,
>> SSRC=0x216DE2D9, Seq=26, Time=4160
>> 44 1.637466 gmtpbx02.redmatter.com lon-avon-
>> four.magrathea.net RTP PT=ITU-T G.711 PCMU, SSRC=0x1855F3A7,
>> Seq=53987, Time=130238592
>>
>> Many thanks,
>> Neil
>> _______________________________________________
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>
>
> _______________________________________________
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
>
> _______________________________________________
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20100721/43d186ff/attachment-0001.html
More information about the FreeSWITCH-users
mailing list